GB2388872A - Engine air intake apparatus - Google Patents

Engine air intake apparatus Download PDF

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Publication number
GB2388872A
GB2388872A GB0308628A GB0308628A GB2388872A GB 2388872 A GB2388872 A GB 2388872A GB 0308628 A GB0308628 A GB 0308628A GB 0308628 A GB0308628 A GB 0308628A GB 2388872 A GB2388872 A GB 2388872A
Authority
GB
United Kingdom
Prior art keywords
thickness
air
bypass passage
intake
connecting portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB0308628A
Other versions
GB2388872B (en
GB0308628D0 (en
Inventor
Masao Ino
Toshio Hayashi
Takashi Chaya
Tetsuji Yamanaka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denso Corp
Original Assignee
Denso Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Denso Corp filed Critical Denso Corp
Publication of GB0308628D0 publication Critical patent/GB0308628D0/en
Publication of GB2388872A publication Critical patent/GB2388872A/en
Application granted granted Critical
Publication of GB2388872B publication Critical patent/GB2388872B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10314—Materials for intake systems
    • F02M35/10321—Plastics; Composites; Rubbers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • F02M35/10026—Plenum chambers
    • F02M35/10032—Plenum chambers specially shaped or arranged connecting duct between carburettor or air inlet duct and the plenum chamber; specially positioned carburettors or throttle bodies with respect to the plenum chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/1034—Manufacturing and assembling intake systems
    • F02M35/10354—Joining multiple sections together
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/104—Intake manifolds
    • F02M35/112—Intake manifolds for engines with cylinders all in one line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
    • F05C2225/08—Thermoplastics

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Abstract

In an air intake apparatus 10, a throttle device 20 forms a main passage 100 and a bypass passage 102, 104. A flow rate of intake air in the bypass passage 102 is variably controlled with an ISC valve member 30 during an engine idle running. A resinous intake manifold 40 includes a surge tank 44, a connecting portion 42 and distribution pipes 46. The surge tank 44 has a thickness t2 substantially the same as a thickness of an aluminium intake manifold. The connecting portion 42 has a thickness t1 that is in a range of one and a half times to two and a half times the thickness t2. Because aluminium has density in a range of one and a half times to two and a half times density of resin, the connecting portion 42 has surface density substantially the same as that of the aluminium intake manifold with the thickness t2.

Description

AIR INTAKE APPARATUS
The present invention relates to air intake apparatus. In particular, the present invention relates 5 to an air intake apparatus having a throttle device with a bypass passage through which intake air flows during an engine idle running, and a resinous intake manifold through which the intake air, a flow rate of which is controlled in the throttle device, is supplied to engine 10 cylinders.
In an air intake apparatus that supplies intake air, a flow rate of which is controlled with a throttle device, into each cylinder through an intake manifold, it is 15 proposed to make the intake manifold with aluminium. For purposes of ease of processing and weight reduction, the intake manifold is made of resin, in place of aluminium.
Also, it is proposed to provide a bypass passage in the throttle device in addition to a main passage and to 20 variably control a flow rate of the intake air in the bypass passage with an ISC (Idle Speed control) valve in accordance with an engine idle running state. Further, it is proposed to regularly control the flow rate of the intake air flowing the bypass passage with an AAS (Air 25 Adjust Screw). The flow rate of the intake air during the
idle running can be controlled with both the ISC valve and the AAS.
Because the flow rate of the intake air required 5 during the idle running is small, flow of the intake air in the bypass passage is largely throttled with the ISC valve and the AAS. By throttling the flow, a flow velocity downstream from the ISC valve member and the AAS largely increases, resulting in turbulent flow. This causes flow 10 noise at downstream sides of the ISC valve member and the AAS. The flow noise has a frequency in a range of 2 kHz to 10 kHz. Because it has a high frequency, the flow noise is likely to pass through the resinous intake manifold easier than the aluminium intake manifold. Therefore, the 15 resinous intake manifold may cause a noise problem.
An embodiment of the present invention seeks to provide an air intake apparatus with reduction of flow noise passing through a resinous intake manifold.
Accordingly the present invention provides an air intake apparatus having a throttle device and a resinous intake manifold.
25 Suitably, the throttle device has a main passage
through which intake air flows, a throttle valve member provided in the main passage to variably control a flow rate of the intake air, a bypass passage provided to bypass the throttle valve member and communicate with the 5 main passage on an upstream side and a downstream side of the throttle valve member, and a throttle means for throttling flow of intake air in the bypass passage.
Suitably, the intake manifold has a surge tank, a connecting portion connecting the throttle device with the 10 surge tank, and distribution pipes through which the intake air that has flowed in the surge tank is distributed to engine cylinders.
Suitably, the connecting portion has a wall with a 15 first thickness and the surge tank a wall with a second thickness. Suitably, the first thickness is greater than the second thickness. Suitably, the wall of the connecting portion has surface density substantially equal to or greater than density of aluminium having the second 20 thickness. Therefore, the connecting portion has a damping effect equal to or higher than that of a connecting portion made of aluminium with the second thickness.
In the intake manifold, a sound pressure of flow 25 noise that is caused by throttling the flow of the intake
air during an engine idle running is likely to increase most in the connecting portion. Because the surface density of the connecting portion increases, the connecting portion suppresses the flow noise passing 5 through the intake manifold Therefore, the thickness of the surge tank and the distribution pipes can be reduced, thereby reducing weight of the intake manifold.
Further particular and preferred aspects of the 10 present invention are set out in the accompanying independent and dependent claims. Features of the dependent claims may be combined with features of the independent claims as appropriate, and in combinations other than those explicitly set out in the claims.
The present invention will be described further, by way of example only, with reference to preferred embodiments thereof as illustrated in the accompanying drawings, in which: Fig. 1 is a cross-sectional view of an air intake apparatus according to an embodiment of the present invention; 25 Fig. 2 is a characteristic diagram showing sound
pressure levels of noise transmission of intake manifolds of the present embodiment and first to third comparisons) and 5 Fig. 3 is a graph showing relationship between sound pressure level reduction effect and a surface ratio.
An embodiment of the present invention will be described in detail with reference to drawings.
Referring to Fig. 1, an air intake apparatus 10 includes a throttle device 20 and an intake manifold 40. A passage member 22 of the throttle device 20 is made of resin. The passage member 22 forms an air intake passage 15 including a main passage 100, a first bypass passage 102 as a variable flow rate bypass passage and a second bypass passage 104 as a fixed flow rate bypass passage. The first and second bypass passages 102, 104 are formed in parallel with respect to the main passage 100. A throttle valve 20 member 24 is formed into a disc shape, and is provided in the main passage 100. A throttle opening degree is adjusted by rotating the throttle valve member 24 in accordance with an engine operation state, thereby controlling a flow rate of the intake air flowing in the 25 main passage 100.
s
/ The first bypass passage 102 bypasses the throttle valve member 24 and communicates with the main passage 100 on a downstream side and an upstream side of the throttle 5 valve member 24. An ISC (Idle Speed Control) valve member 30 is provided in the first bypass passage 102 as a bypass valve member of a throttle means. A flow rate of intake air flowing in the first bypass passage 102 during the idle running is variably controlled by rotation of the ISC 10 valve member 30 during the engine idle running. That is, the ISC valve member 30 variably controls the flow rate of the intake air flowing in the first bypass passage 102 irrespective of the throttle opening degree of the throttle valve member 24.
The second bypass passage 104 bypasses the throttle valve member 24 and communicates with the main passage 100 on the upstream side and the downstream side of the throttle valve member 24. An AAS (Air Adjust Screw) 34 as 20 a screw member of the throttle means is provided to protrude in the second bypass passage 104. By adjusting a screwing amount (protruding amount) of the AAS 34, a flow rate of intake air flowing in the second bypass passage 104 is fixed. An idling engine speed, which varies in 25 every engine, can be corrected by adjusting the screwing
amount of the AAS 34.
The intake manifold 40 is integrally molded of resin. The intake manifold 40 includes a surge tank 44, a S connecting portion 42 connecting the surge tank 44 with the passage member 22 and distribution pipes 46 for distributing the intake air that has flowed in the surge tank 44 from the passage member 22 through the connecting portion 42 into each of the engine cylinders.
The intake manifold 40 is formed such that walls forming the surge tank 44 and the distribution pipes 46 have thicknesses substantially the same as a thickness of a wall of an intake manifold made of aluminium. Here, the 15 walls of the surge tank 44 and the distribution pipes 46 have thickness (second thickness) t2. The wall of the connecting portion 42 has thickness (first thickness) tl.
The thickness tl is in a range of one and a half times to two and a half times the thickness t2 (1.5t2 tl s 20 2.5t2). Aluminium has density in a range of one and a half times to two and a half times density of the resin.
Therefore, the surface density of the connecting portion 25 42 with the thickness tl is substantially the same as the
density of a connecting portion of the aluminium intake manifold with the thickness t2. Here, the surface density is a quantity of a member in a unit area. Therefore, the surface density increases in accordance with an increase 5 in the thickness of the member.
During an engine normal operation, the throttle device 20 controls the flow rate of the intake air to be supplied to each cylinder by adjusting the throttle 10 opening degree of the throttle valve member 24 in accordance with the engine operation state. During the engine idle running, the throttle valve member 24 is fully closed. The idling engine speed, which varies in every engine, can be corrected by adjusting the screwing amount 15 of the AAS 34 as described above. Further, the throttle device 20 controls the flow rate of the intake air by adjusting the opening degree of the ISC valve member 30 in accordance with the engine operation state during the engine idle running.
When the flow in the bypass passage 102 is throttled with the ISC valve member 30, the flow noise with high frequency occurs on a downstream side of the ISC valve member 30. Sound pressure of the flow noise increases most 25 in the connecting portion 42.
Fig. 2 shows a measured result of a sound pressure level of flow noise passing through the intake manifold of each of the present embodiment and first to third S comparisons. The first comparison is the case that the intake manifold is made of resin with the thickness t2.
The second comparison is the case that the intake manifold is made of aluminium with the thickness t2. The third comparison is the case that the intake manifold is made of 10 resin with the thickness tl.
The sound pressure level of the present embodiment in which the thickness of the wall of only the connecting portion 42 is increased is substantially the same as that 15 of the third comparison in which the thickness of the wall of the resinous intake manifold is entirely increased.
Also, the sound pressure level of the present embodiment is lower than that of the first comparison. Although it is not as much as the second comparison, the present 20 embodiment provides a sound pressure reducing effect substantially similar to that of the second comparison.
As shown in Fig. 3, in a case that the wall of the connecting portion 42, the thickness of which is 25 increased, has an area ratio equal to or more than seventy
percent with respect to the whole surface area of the connecting portion 42, the connecting portion 42 provides high sound pressure reduction effect.
S In addition to configuration of the present embodiment, the outer periphery of the connecting portion can be covered with a damping material, thereby further reducing transmission of the flow noise.
10 In the present embodiment, the wall of connecting portion 42 is increased in thickness so that the surface density of the wall of the connecting portion 42 is substantially equal to or higher than that of the aluminium intake manifold with the thickness t2.
15 Therefore, the flow noise passing through the intake manifold 40 is reduced.
The wall of the connecting portion 42 is increased in thickness to have a high flow noise transmission 20 reducing effect, as compared with the aluminium intake manifold with the thickness t2. The walls of the surge tank 44 and the distribution pipes 46 have the thickness substantially the same as that of the intake manifold entirely made of aluminium. Therefore, the intake manifold 25 is reduced in weight while reducing transmission of the
flow noise.
Although the intake manifold 40 is integrally molded of resin to make its assembly easy, it can be constructed 5 of a plurality of resinous members. Also, the thickness tl of the connecting portion 42 can be increased more than two and a half times the thickness t2 of the surge tanks 44 and the distribution pipes 46. In this embodiment, the walls of the surge tank 44 and the distribution pipes 46 10 have the thickness t2. However, it is not always necessary that the walls of the distribution pipes 46 have the same thickness as the wall of the surge tank 44.
The throttle device 20 has both the ISC valve member 15 30 and the AAS 34. However, the throttle device that has only one of the ISC valve member 30 and the AAS 34 can be used. In the throttle device having only one of the ISC valve member 30 and the AAS 34, the flow noise is caused on the downstream side of the ISC valve member 30 or the 20 AAS 34 by throttling the passage area of the bypass passage. An orifice can be formed in the bypass passage as the throttle means, in place of the ISC valve member and the AAS 34.
25 Although particular embodiments have been described
herein, it will be appreciated that the invention is not limited thereto and that many modifications and additions thereto may be made within the scope of the invention.

Claims (11)

1. An air intake apparatus for supplying intake air to 5 engine cylinders comprising: a throttle device including a main passage through which intake air flows, a throttle valve member provided in the main passage to variably control a flow rate of the intake air, a bypass passage provided to bypass the 10 throttle valve member and communicate with the main passage on an upstream side and a downstream side of the throttle valve member, and a throttle means provided in the bypass passage to throttle flow of the intake air in the bypass passage; and 15 a resinous intake manifold including a surge tank, a connecting portion connecting the throttle device with the surge tank, and distribution pipes through which the intake air that has flowed in the surge tank is distributed to the cylinders, 20 wherein the connecting portion has a wall with a first thickness and the surge tank has a wall with a second thickness, the first thickness is greater than the second thickness, and the wall of the connecting portion has surface density substantially equal to or greater than 25 density of aluminium with the second thickness.
2. An air intake apparatus according to claim 1, wherein the throttle means includes a bypass valve member that variably controls a flow rate of the intake air in 5 the bypass passage during an engine idle running.
3. An air intake apparatus according to claim 1, wherein the throttle means includes a screw member that fixes a flow rate of the intake air in the bypass passage with its 10 screwing amount.
4. An air intake apparatus according to claim 1, wherein the bypass passage includes a first bypass passage and a second bypass passage, both arranged in 15 parallel with respect to the main passage, wherein the first bypass passage has a bypass valve member that variably controls a flow rate of intake air in the first bypass passage during an engine idle running, and the second bypass passage has a screw member that 20 fixes a flow rate of intake air in the second bypass passage with its screwing amount.
5. An air intake apparatus according to any one of claims 1 to 4, wherein the first thickness is equal to or 25 greater than one and a half times the second thickness.
6. An air intake apparatus according to any one of claims 1 to 4, wherein the first thickness is in a range of one and 5 a half to two and a half times the second thickness.
7. An air intake apparatus according to any one of claims 1 to 6, wherein the intake manifold is integrally 10 molded of resin.
8. An air intake apparatus according to any one of claims 1 to 7, wherein the intake manifold further includes a damping material that surrounds an outer 15 periphery of the connecting portion.
9. An air intake apparatus according to any one of claims 1 to 8, wherein the wall of the connecting portion has a 20 surface ratio equal to or greater than seventy percent with respect to a whole surface area of the connecting portion.
25
10. An air intake apparatus according to any one of
claims 1 to 9, wherein the distribution pipes have walls with thickness substantially the same as the second thickness. 5
11. An air intake apparatus as herein described above and illustrated in the accompanying drawings.
IS
GB0308628A 2002-04-17 2003-04-14 Air intake apparatus Expired - Fee Related GB2388872B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002114602A JP3882906B2 (en) 2002-04-17 2002-04-17 Intake device

Publications (3)

Publication Number Publication Date
GB0308628D0 GB0308628D0 (en) 2003-05-21
GB2388872A true GB2388872A (en) 2003-11-26
GB2388872B GB2388872B (en) 2005-08-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB0308628A Expired - Fee Related GB2388872B (en) 2002-04-17 2003-04-14 Air intake apparatus

Country Status (2)

Country Link
JP (1) JP3882906B2 (en)
GB (1) GB2388872B (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4364347A (en) * 1979-09-20 1982-12-21 Toyota Jidosha Kogyo Kabushiki Kaisha Method of adjusting idle speed of an internal combustion engine
JPH02181063A (en) * 1989-02-06 1990-07-13 Isuzu Motors Ltd Intake manifold for internal combustion engine
US5035217A (en) * 1989-05-10 1991-07-30 Mitsubishi Denki K.K. Idling adjusting method
JP2001132567A (en) * 1999-11-02 2001-05-15 Toyo Roki Mfg Co Ltd Intake device
EP1211399A2 (en) * 2000-12-01 2002-06-05 Denso Corporation Suction device used for internal combustion engine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4364347A (en) * 1979-09-20 1982-12-21 Toyota Jidosha Kogyo Kabushiki Kaisha Method of adjusting idle speed of an internal combustion engine
JPH02181063A (en) * 1989-02-06 1990-07-13 Isuzu Motors Ltd Intake manifold for internal combustion engine
US5035217A (en) * 1989-05-10 1991-07-30 Mitsubishi Denki K.K. Idling adjusting method
JP2001132567A (en) * 1999-11-02 2001-05-15 Toyo Roki Mfg Co Ltd Intake device
EP1211399A2 (en) * 2000-12-01 2002-06-05 Denso Corporation Suction device used for internal combustion engine

Also Published As

Publication number Publication date
GB2388872B (en) 2005-08-03
GB0308628D0 (en) 2003-05-21
JP3882906B2 (en) 2007-02-21
JP2003314389A (en) 2003-11-06

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Legal Events

Date Code Title Description
746 Register noted 'licences of right' (sect. 46/1977)

Effective date: 20060906

PCNP Patent ceased through non-payment of renewal fee

Effective date: 20130414